organic chemistry

Question 1

How was crude oil formed

What does it consist mostly ofl

Answer 1

plankton buried underwater and compressed over a long time

consist mainly of hydrocarbons

Question 2

what are hydrocarbons

Answer 2

molecules that consist of carbon and hydrogen atoms only

Question 3

first four alkanes

Answer 3

methane
ethane
propane
butane

Question 4

general formular for alkanes

Answer 4

CnH2n+2

Question 5

difference between alkanes and alkenes

Answer 5

alkenes have at least one double covalent bond

alkanes are saturated alkenes are unsaturated

Question 6

kerosene is used in

Answer 6

jet fuel

Question 7

petrol is used in

Answer 7

cars

Question 8

longer alkanes have________ __________

Answer 8

higher viscosity

Question 9

shorter alkanes are _____ ___________

Answer 9

more flammable

Question 10

3 uses of hydrocarbons

Answer 10

lubricants
detergents
solvents
polymers (made from alkenes not alkanes)

Question 11

formula for alkenes

Answer 11

CnH2n

Question 12

testing for alkenes

Answer 12

alkenes will turn bromine water from orange to colourless

Question 13

which alkanes are more in demand
shorter or longer

Answer 13

shorter

Question 14

what does cracking do

Answer 14

we use cracking to break longer alkanes into a shorter alkane and alkenes which meets the demand

Question 15

what colour does bromine water change to In the presence of alkenes

Answer 15

orange to colourless

Question 16

2 types of cracking

Answer 16

catalytical cracking

thermal decomposition

Question 17

thermal decomposition

Answer 17

breaking molecules down by heating them

Question 18

Test for alkenes and colour change

Answer 18

Bromine water
Orange to colourless

Question 19

Test for hydrgen

Results

Answer 19

Lowering burning split into gas

Burn with a squeaky pop sound

Question 20

In fractional distilation each fraction _____ at different levels

Answer 20

Condense